本文阐释了《合同法》第286条中优先受偿权的性质，并对建筑企业合理有效地行使优选受偿权进行了探讨。优先受偿权是国家立法给建筑行业的一把尚方宝剑，建筑工程承包人要合法有效地用这把利器来解决工程拖欠款的问题。

This paper describes the properties of priority of indemnity stipulated in clause 286 of ((Contract Law))and explores effective and reasonable application of priority of indemnity by construction enterprise. Priority of indemnity is an imperial sword to construction enterprise given by state law and construction contractor should use ii to resolve the problem of pryment in arrears.